Entity: io_FrequencyCounter
- File: io_FrequencyCounter.vhdl
Diagram
Description
EMACS settings: -- tab-width: 2; indent-tabs-mode: t -- vim: tabstop=2:shiftwidth=2:noexpandtab
kate: tab-width 2; replace-tabs off; indent-width 2;
Authors: Patrick Lehmann
Entity: TODO
Description:
.. TODO:: No documentation available.
License:
Copyright 2007-2014 Technische Universitaet Dresden - Germany Chair of VLSI-Design, Diagnostics and Architecture
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and
limitations under the License.
Generics
| Generic name | Type | Value | Description |
|---|---|---|---|
| CLOCK_FREQ | FREQ | 100 MHz | |
| TIMEBASE | time | 1 sec | |
| RESOLUTION | positive | 8 |
Ports
| Port name | Direction | Type | Description |
|---|---|---|---|
| Clock | in | std_logic | |
| Reset | in | std_logic | |
| FreqIn | in | std_logic | |
| FreqOut | out | std_logic_vector(RESOLUTION - 1 downto 0) |
Signals
| Name | Type | Description |
|---|---|---|
| TimeBaseCounter_us | unsigned(TIMEBASECOUNTER_BITS - 1 downto 0) | |
| TimeBaseCounter_ov | std_logic | |
| FrequencyCounter_us | unsigned(FREQUENCYCOUNTER_BITS downto 0) | |
| FrequencyCounter_ov | std_logic | |
| FreqIn_d | std_logic | |
| FreqIn_re | std_logic | |
| FreqOut_d | std_logic_vector(RESOLUTION - 1 downto 0) |
Constants
| Name | Type | Value | Description |
|---|---|---|---|
| TIMEBASECOUNTER_MAX | positive | TimingToCycles(TIMEBASE, CLOCK_FREQ) |
|
| TIMEBASECOUNTER_BITS | positive | log2ceilnz(TIMEBASECOUNTER_MAX) | |
| REQUENCYCOUNTER_MAX | positive | 2**RESOLUTION | |
| FREQUENCYCOUNTER_BITS | positive | RESOLUTION |
Processes
- unnamed: ( Clock )
Description
timebase counter
- unnamed: ( Clock )
Description
frequency counter
- unnamed: ( Clock )
Description
hold counter value until next TimeBaseCounter event